세미나

Polymer Dots for Photocatalysis

Organic Polymer Dots for Photocatalysis Organic polymeric photocatalysts have been attracted scientists’ interests during past years due to their low-cost, tunable bandgaps and energy levels, and promising photocatalytic performance. Making the traditional hydrophobic polymeric photocatalyst into nano-particles with size less than 100 nm, so-called polymer dots (Pdots), has shown significantly enhanced photocatalytic activity. Rational design of organic polymers is one of strategies to improve photocatalytic performance for hydrogen production. Moreover, making heterojunction Pdots can efficiently separate photogenerated charges within Pdots as well as utilize energy transfer process to enhance the light harvesting efficiency.  In this talk, I will discuss our research achievements in optimization of polymer structures on Pdots photocatalysis, study of photocatalytic mechanism in heterojunction Pdots systems and applications of Pdots in bio-hybrid photocatalytic systems....

Applications of Additive Manufacturing to Mobility Industries

This lecture aims to explore the potential impact of 3D printing on the automotive and construction fields. With the rapid development of 3D printing technology, it has become increasingly feasible to create complex, customized parts and structures that were previously impossible or prohibitively expensive using...

Polymeric Materials for Energy Storage Applications

Polymeric Materials for Energy Storage Applications Soojin Park Department of Chemistry, POSTECH (email: soojin.park@postech.ac.kr) Riding on the rapid growth in electric vehicles and the stationary energy storage market, high-energy-density lithium-ion batteries and next-generation rechargeable batteries (i.e., advanced batteries) have been long-accepted as essential building blocks for future technology...

ITER plasma operational space and scenarios

Occurrence, detection, and distribution of microplastic and -associated ARGs in the Upper Region of Han River

The behavior of nanoscale zerovalent iron in aqueous phases

Stretchable Electronics: Materials, Fabrication, and Applications

Stretchable Electronics: Materials, Fabrication, and Applications   Ja Hoon Koo1   1Department of Semiconductor Systems Engineering, Sejong University, Seoul 08826, Republic of Korea.   Stretchable devices based on high-performance inorganic materials require the use of stretchable device designs such as wavy interconnects and kirigami structures, which sacrifices the device density to...

Augmented Aquacatalysis to Access SuFEx Click Hubs

Water-Accelerated Synergistic Organocatalysis to Access Alkylsulfonyl Fluorides as Efficient SuFEx Hubs     Han Yong Bae Department of Chemistry, Sungkyunkwan University, Suwon, 16419, Korea E-mail: hybae@skku.edu   Along with the significant demand for sustainable homogeneous catalysis, the importance of efficient synthesis and simple purification of complex organic compounds is attracting attention.1 In this presentation, a series of water-accelerated chemical transformations will be discussed. Firstly, unprecedented N-heterocyclic carbene (NHC)-catalyzed aza-Michael addition reaction is shown to access β-aminosulfonyl fluorides, which are key hubs of the sulfur(VI) fluoride exchange (SuFEx) reaction.2 In addition, new methods based on high-turnover catalytic Michael and thia-Michael addition reactions via significant hydrophobic amplification are displayed.3–5 Finally, the synergistic action of a hydrophobic Brønsted acid in combination with a hydrogen-bonding donor activator enabled the formation of the three-component Petasis-type allylation reaction.6 The developed exceptionally mild but potent catalytic systems facilitated a broad substrate scope, and enabled efficient multi-gram scalabilities. As a crucial reaction medium in all cases, water considerably augmented the reaction rate with excellent chemo- and site-selectivity (up to >99:1) compared to conventional organic solvents....

Principles of magnetic bearings and their applications to industrial machines

Active magnetic bearings are a mechatronic device which utilizes magnetic forces to levitate rotating shaft without mechanical contact. They enable higher speeds because of reduced losses. Also, the dynamics of the system can be adjusted by modifying the control law of magnetic bearings. In this...

Innovative adhesive platform biomaterial for tissue regeneration and drug delivery therapy

Adhesive Platform Biomaterials for Tissue Regenerative and Drug Delivery Therapeutics​   Hyung Joon Cha   Department of Chemical Engineering, Pohang University of Science and Technology,  Pohang 37673, Korea E-mail: hjcha@postech.ac.kr   Marine mussel adhesion is known to be mediated by adhesive proteins, which are secreted through the mussel byssus and have great potential as biologically and environmentally friendly adhesive biomaterials due to their biocompatibility and biodegradability. In addition, mussel adhesive proteins have strong adhesion ability even on wet and underwater surfaces due to their unique amino acid arrangements and composition. However, researches using the natural amino acid composition have been limited due to extreme difficulties in obtaining sufficient quantities of mussel adhesive proteins for practical applications and commercialization. Previously, we successfully produced redesigned mussel adhesive protein using a bacterial expression system and this bioengineered mussel adhesive protein showed significant adhesion ability and biocompatibility. In this talk, I will present our research team’s efforts on development and evaluation of mussel adhesive protein as an innovative adhesive biomaterial in diverse regenerative medicine and localized drug delivery....